Based on the principles of convection, conduction and thermal radiation, which scenario below is most similar to the following situation?Heat traveling through the ceiling from your bedroom to the attic.
A) Feeling a metal wire get warmer as you roast a marshmallow over a fire.
B) Warm air rising in a room where the air is moving.
C) The sun warming up the roof on a house.
D) Cold water sinking in a pot of water being warmed up on the stove.

Answers

Answer 1

Answer:
The situation (heat going through the ceiling) describes
conduction ... heat going from one place to another by
soaking through some material.

A). This is the one. Heat goes from from the marshmallow
to your hand by soaking through the wire. This is conduction too.

B). No. The heat in the room goes from the floor to the ceiling
because the warm air rises and carries it there. This is convection.

C). No. There's nothing for the heat to soak through between
the sun and the roof, and nothing that can move from the sun
to the roof and bring the heat with it. This is radiation.

D). No. Cold water sinks from the surface to the bottom because
warm water rose from the bottom to the surface, taking heat with it.
This is convection.

Answer 2

Answer:

The answer is

A) Feeling a metal wire get warmer as you roast a marshmallow over a fire.

HOPE I HELPED (:

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What activities can you do on Jupiter?!

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falling, you can also suffer from severe radiation sickness and be crushed.

The __________ is the layer of the atmosphere where satellites and the space shuttle orbit the Earth.a. troposphere
c. mesosphere
b. stratosphere
d. exosphere

Answers

Answer: d. exosphere

The exosphere is the outermost layer of the atmosphere of earth. It is present above the thermosphere which is lying above the earth. From this layer, the atoms and molecules escape out, which maintains an environment for the movement of satellites and space shuttles.

The most likely answer, according to an informational article I have read, on the earths atmosphere, is exosphere. Hope it helps! If u need more info, message me!

A bicyclist bikes the 56 mi to a city averaging a certain speed. The return trip is made at a speed that is 6 mph slower. Total time for the round trip is 11 hr. Find the bicyclist's average speed on each part of the trip.

Answers

Answer:

Speed of the bicyclist when going to city = 14 miles per hour.

Speed while return trip = 8 miles per hour.

Explanation:

Let the speed of the bicyclist when going to city = x miles per hour.

Speed while return trip = x - 6 miles per hour.

Total time taken = 11 hrs = Time for the trip to city + time taken for return trip.

Also, Time = Distance / Time.

So,

56 / x + 56 / ( x -6) = 11

11x² -178x + 336 = 0

Solving for x we get:

Acceptable x = 14 miles per hour.

Speed while return trip = x - 6 miles per hour = 8 miles per hour.

Final answer:

To find the average speed on each part of the trip, use the formula Average speed = Total distance/Total time and set up an equation to solve for the unknown speeds.

Explanation:

To find the average speed on each part of the trip, we can use the formula Average speed = Total distance/Total time. Let's assume the average speed on the first part of the trip (56 miles) is x mph. Since the return trip is made at a speed that is 6 mph slower, the average speed on the second part of the trip is (x - 6) mph. We know that the total time for the round trip is 11 hours. So, we can set up the equation:

56/x + 56/(x - 6) = 11

Now, we can solve this equation to find the value of x, which represents the average speed on the first part of the trip. Once we have x, we can find the average speed on the second part of the trip by subtracting 6 from x.

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The orbits of planets being elliptical was one the planetary laws developed by

Answers

The correct answer is Kepler

Final answer:

The concept that planets move in elliptical orbits was established by Johannes Kepler in his First Law of Planetary Motion. This significant idea disrupted the earlier belief of circular orbits and brought tremendous knowledge in our solar system understanding.

Explanation:

The fact that the orbits of planets are elliptical was part of the planetary laws developed by the renowned astronomer and mathematician Johannes Kepler. Damaging the former belief of circular orbits, Kepler, based on detailed and exhaustive astronomic observations, established his First Law of Planetary Motion which stated that planets move in elliptical orbits with the Sun at one of the two foci. This was a significant breakthrough in understanding our solar system and continues to be fundamental in physics and astronomy today.

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If an object moves in uniform circular motion in a circle of radius R = 1.0 meter, and the object takes 4.0 seconds to complete ten revolutions, calculate the centripetal acceleration.

Answers

Answer:

$a_c=246.5 (m)/(s^2)$

Explanation:

The formula for centripetal acceleration is:

$a_c=rw^2$

Where,

$r:$ radius.

$w:$ Angular speed.

Angular speed is defined by:

$w=(\Delta\theta)/(\Delta t)$

Where,

$\theta:$ position angle.

$t:$ time.

In this case we have that the object takes 4.0 seconds to complete ten revolutions.

You have to know that 1 revolution = $2\pi rad$ , then

10 revolutions= $10.2\pi rad = 20\pi rad$

Replacing

$\Delta\theta=20\pi rad\n\Delta t=4.0s$

in the formula of Angular speed:

$w=(\Delta\theta)/(\Delta t)\n\nw=(20\pi rad)/(4.0s)$

$w=5\pi (rad)/(s)\nw=15.7(rad)/(s)$

Now we have,

$a_c=rw^2\na_c=r(15.7(rad)/(s))^2$

r=1.0m

$a_c=1.0m(15.7(rad)/(s))^2\n\na_c=1.0(246.5)(m)/(s^2) \n\na_c=246.5(m)/(s^2)$

Then the centripetal acceleration is:

$a_c=246.5 (m)/(s^2)$

a = ω²r

r = 1 m
ω = 2πf = 2π * 10 / 4 = π*5 s⁻¹

A boat is headed due east across a river at a velocity of 25 meters/second with respect to the water. The velocity of the river current is 2.7 meters/second due north. What is the angle at which the boat will deviate from its original path?

Answers

V(b-w)= 25i +0j

V(w) = 0i +2.7j

The resultant velocity V(b -w) =Vb -Vw

Therefore Vb = 25i+2.7j

The angle is calculated as follows:

ArcTan 2.7/25 = 6.16 degrees

The angle at which the boat will deviate from its original path would be 6.2 degrees. Hope this answers the question. Have a nice day.

Answer:

6.2

Explanation:

plato user

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